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Visibility: science and regulation.

John G Watson1

  • 1Desert Research Institute, University and Community College System of Nevada, Reno 89512-1095, USA. johnw@dri.edu

Journal of the Air & Waste Management Association (1995)
|June 21, 2002
PubMed
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The 1999 Regional Haze Rule

Area of Science:

  • Atmospheric science and environmental regulation.
  • Visibility science and air quality monitoring.

Background:

  • The 1999 Regional Haze Rule established regulatory context for visibility.
  • Current scientific understanding and metrics for visibility are reviewed.
  • Challenges in defining natural visibility and accounting for international emissions are noted.

Purpose of the Study:

  • To review the science of visibility and its application in regulatory guidance.
  • To assess the adequacy of the scientific basis for the 1999 Regional Haze Rule.
  • To identify areas for improvement in visibility science and regulatory approaches.

Main Methods:

  • Review of scientific literature and regulatory frameworks.
  • Analysis of visibility metrics, including the deciview scale.

Related Experiment Videos

  • Evaluation of emission sources and atmospheric modeling approaches.

    • Main Results:

    • The scientific basis for the 1999 rule is adequate, but definitions need refinement.
    • Sulfur dioxide (SO2) emission reductions correlate with improved visibility.
    • Complex models show discrepancies; simpler models are recommended for emission reduction strategies.

    Conclusions:

    • Visibility science is adequate for current regulations but requires future refinement.
    • Simpler, targeted models are more effective for understanding emission reduction impacts.
    • Addressing non-road emissions and episodic natural events is crucial for future visibility improvements.